I understand perhaps the barber on the Enterprise, or the waiters in Ten Forward. You want a ride on the starship, but you're not smart enough to get through the academy, so you sign on as a waiter. But there were still people doing this kind of shit on earth. Like at Sisko's dad's restaurant. Who the hell, given the wonders of the future, free of want and worry, says "I'm going to go wait tables for 8 hours at a stretch!"
Waiting tables isn't all that bad when you're not doing it because you have to feed your family and you have to work long shifts whether you're sick or not because you can't afford to take time off. Especially when you're dealing with a relatively affluent clientele that understands your explanation "Oh, the soup is cold because the replicator is on the fritz".
I waited on executives and bused tables for everyone else at a corporate campus cafeteria while in college, and it was one of the easiest jobs I've had. They didn't even complain to me about the food if it didn't come out right since it was their own company's chef that prepared it. Food was so cheap to employees that it might as well have been free. Since it was at the workplace, everyone was nice and didn't leave any big messes or anything, the worst we had to deal with was when someone accidentally dropped a tray and we had to mop it up, but even then the tray dropper was very apologetic and helped to clean up. This is what I imagine waiting on tables in the Star Trek world must be like.